# Ca–Pb system

> Ca–Pb system: 82 accepted literature values (invariant reaction 32, formation 29, mixing / partial 12, phase transition 9) and 3 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/CA-PB.html · Markdown: https://data.orchid-project.org/systems/CA-PB.md

82 accepted literature values from 2 paper(s) (experimental 34, model 48); 3 calculated phase diagram(s). 16 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: [JSON](https://data.orchid-project.org/literature/systems/CA-PB.json) · [CSV](https://data.orchid-project.org/systems/CA-PB.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CA-PB) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CA-PB/CaPb-04Car.json) · [phases (8)](https://data.orchid-project.org/phases/pages/CA-PB.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CA-PB.html) · [Markdown](https://data.orchid-project.org/systems/CA-PB.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 34 |
| model | 48 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 32 |
| phase transition | 9 |
| formation | 29 |
| mixing / partial | 12 |

## Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Table: Assessments with a calculated phase diagram

| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| CaPb-04Car.tdb | Y. Cartigny, J.M. Fiorani, A. Maitre, M. Vilasi, Thermochim. Acta, 414, 197-202(2004). [doi:10.1016/j.tca.2004.01.001](https://doi.org/10.1016/j.tca.2004.01.001) | `189da9f48238a281880f6dd45f8bd40ae6124ab40a5243ee040846e0353af3f9` | [viewer](https://orchid-project.org/phase-diagrams/#CA-PB/CaPb-04Car.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CaPb-04Car.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CaPb-04Car.json) |
| CaPb-08Idb.tdb | M. Idbenali, C. Servant, N. Selhaoui, L. Bouirden, Calphad, 32, 64-73(2008). [doi:10.1016/j.calphad.2007.10.004](https://doi.org/10.1016/j.calphad.2007.10.004) | `605c17cf815082fd690abd8b74805821ebb664edc2226c998a5fa65b9a831027` | [viewer](https://orchid-project.org/phase-diagrams/#CA-PB/CaPb-08Idb.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CaPb-08Idb.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CaPb-08Idb.json) |
| CaPb-89Not.tdb | M. Notin, L. Bouirden, E. Belbacha, J. Hertz, J. Less Common Met., 154, 121-35(1989). [doi:10.1016/0022-5088(89)90177-X](https://doi.org/10.1016/0022-5088%2889%2990177-X) | `56357d039a751b6d0f953a66ebc9a60ed52ed115983bbb4b3c7aa419e255adc1` | [viewer](https://orchid-project.org/phase-diagrams/#CA-PB/CaPb-89Not.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CaPb-89Not.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CaPb-89Not.json) |

Table: Calculated three-phase invariants (model, mole fraction of the second component)

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| CaPb-04Car.tdb | 1403.04 | CA2PB_C37 (x(Pb) 0.33333) + CA5PB3 (x(Pb) 0.375) + LIQUID (x(Pb) 0.40801) |
| CaPb-04Car.tdb | 1238 | CA5PB3 (x(Pb) 0.375) + CAPB_L10 (x(Pb) 0.5) + LIQUID (x(Pb) 0.5002) |
| CaPb-04Car.tdb | 1021.08 | BCC_A2 (x(Pb) 0) + LIQUID (x(Pb) 0.1002) + CA2PB_C37 (x(Pb) 0.33333) |
| CaPb-04Car.tdb | 896.76 | CAPB_L10 (x(Pb) 0.5) + LIQUID (x(Pb) 0.68523) + CAPB3_L12 (x(Pb) 0.75) |
| CaPb-04Car.tdb | 716.03 | BCC_A2 (x(Pb) 0) + FCC_A1 (x(Pb) 0) + CA2PB_C37 (x(Pb) 0.33333) |
| CaPb-04Car.tdb | 601.95 | CAPB3_L12 (x(Pb) 0.75) + LIQUID (x(Pb) 0.99593) + FCC_A1 (x(Pb) 0.99607) |
| CaPb-04Car.tdb | 601.95 | CAPB3_L12 (x(Pb) 0.75) + LIQUID (x(Pb) 0.99595) + FCC_A1 (x(Pb) 0.99608) |
| CaPb-04Car.tdb | 601.95 | CAPB3_L12 (x(Pb) 0.75) + LIQUID (x(Pb) 0.99604) + FCC_A1 (x(Pb) 0.99613) |
| CaPb-08Idb.tdb | 1398.31 | CA2PB_C37 (x(Pb) 0.33333) + CA5PB3 (x(Pb) 0.375) + LIQUID (x(Pb) 0.39377) |
| CaPb-08Idb.tdb | 1246.81 | CA5PB3 (x(Pb) 0.375) + LIQUID (x(Pb) 0.49101) + CAPB_L10 (x(Pb) 0.5) |
| CaPb-08Idb.tdb | 1015.45 | BCC_A2 (x(Pb) 0) + LIQUID (x(Pb) 0.07707) + CA2PB_C37 (x(Pb) 0.33333) |
| CaPb-08Idb.tdb | 911.15 | CAPB_L10 (x(Pb) 0.5) + LIQUID (x(Pb) 0.69739) + CAPB3_L12 (x(Pb) 0.75) |
| CaPb-08Idb.tdb | 716.03 | BCC_A2 (x(Pb) 0) + FCC_A1 (x(Pb) 0) + CA2PB_C37 (x(Pb) 0.33333) |
| CaPb-08Idb.tdb | 599.07 | CAPB3_L12 (x(Pb) 0.75) + LIQUID (x(Pb) 0.99337) + FCC_A1 (x(Pb) 0.99682) |
| CaPb-08Idb.tdb | 599.07 | CAPB3_L12 (x(Pb) 0.75) + LIQUID (x(Pb) 0.99345) + FCC_A1 (x(Pb) 0.99684) |
| CaPb-89Not.tdb | 1435.57 | CA2PB_C37 (x(Pb) 0.33333) + CA5PB3 (x(Pb) 0.375) + LIQUID (x(Pb) 0.39023) |
| CaPb-89Not.tdb | 1435.57 | CA2PB_C37 (x(Pb) 0.33333) + CA5PB3 (x(Pb) 0.375) + LIQUID (x(Pb) 0.39022) |
| CaPb-89Not.tdb | 1435.57 | CA2PB_C37 (x(Pb) 0.33333) + CA5PB3 (x(Pb) 0.375) + LIQUID (x(Pb) 0.39015) |
| CaPb-89Not.tdb | 1236.35 | CA5PB3 (x(Pb) 0.375) + CAPB_L10 (x(Pb) 0.5) + LIQUID (x(Pb) 0.50252) |
| CaPb-89Not.tdb | 1236.35 | CA5PB3 (x(Pb) 0.375) + CAPB_L10 (x(Pb) 0.5) + LIQUID (x(Pb) 0.50265) |
| CaPb-89Not.tdb | 1236.35 | CA5PB3 (x(Pb) 0.375) + CAPB_L10 (x(Pb) 0.5) + LIQUID (x(Pb) 0.50271) |
| CaPb-89Not.tdb | 1050.38 | BCC_A2 (x(Pb) 0) + LIQUID (x(Pb) 0.11673) + CA2PB_C37 (x(Pb) 0.33333) |
| CaPb-89Not.tdb | 861.33 | CAPB_L10 (x(Pb) 0.5) + LIQUID (x(Pb) 0.66186) + CAPB3_L12 (x(Pb) 0.75) |
| CaPb-89Not.tdb | 861.33 | CAPB_L10 (x(Pb) 0.5) + LIQUID (x(Pb) 0.66179) + CAPB3_L12 (x(Pb) 0.75) |
| CaPb-89Not.tdb | 861.33 | CAPB_L10 (x(Pb) 0.5) + LIQUID (x(Pb) 0.66187) + CAPB3_L12 (x(Pb) 0.75) |
| CaPb-89Not.tdb | 716.03 | BCC_A2 (x(Pb) 0) + FCC_A1 (x(Pb) 0) + CA2PB_C37 (x(Pb) 0.33333) |
| CaPb-89Not.tdb | 598.1 | CAPB3_L12 (x(Pb) 0.75) + LIQUID (x(Pb) 0.99619) + FCC_A1 (x(Pb) 1) |
| CaPb-89Not.tdb | 598.1 | CAPB3_L12 (x(Pb) 0.75) + LIQUID (x(Pb) 0.99621) + FCC_A1 (x(Pb) 1) |
| CaPb-89Not.tdb | 591.84 | CA2PB_C37 (x(Pb) 0.33333) + CA5PB3 (x(Pb) 0.375) + CAPB_L10 (x(Pb) 0.5) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CA/CA-PB.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CA/CA-PB.json) · [CALPHAD hull CaPb-04Car](https://data.orchid-project.org/hulls/calphad-sgte/CA/CA-PB--CaPb-04Car.json) · [CALPHAD hull CaPb-89Not](https://data.orchid-project.org/hulls/calphad-sgte/CA/CA-PB--CaPb-89Not.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Ca–Pb system (32)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1476.52 | congruent melting: Liq ↔ Ca2Pb | Liq: Pb 0.333; Ca2Pb: Pb 0.333 | model | [1] Cartigny 2004 | Table 3, p. 4, row 6; `ORC-VVWGKNHRGL` |  |
| 1476.15 | congruent melting: Liq ↔ Ca2Pb | Liq: Pb 0.333; Ca2Pb: Pb 0.333 | experimental | [1] Cartigny 2004; _cites Bruzzone 1976_ [doi](https://doi.org/10.1016/0022-5088%2876%2990236-8) | Table 3, p. 4, row 7; `ORC-K564OHOF5P` |  |
| 1403.23 | peritectic: Liq + Ca2Pb ↔ Ca5Pb3 | Liq: Pb 0.4078; Ca2Pb: Pb 0.333; Ca5Pb3: Pb 0.375 | model | [1] Cartigny 2004 | Table 3, p. 4, row 8; `ORC-AY3RW57JW3` |  |
| 1403.23 | Ca5Pb3 -> Ca2Pb + Liq. | Ca5Pb3: Pb 0.375; Ca2Pb: Pb 0.333333; L: Pb 0.4078 | model | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 4, p. 5, row 8; `ORC-DDOUAEKQGC` |  |
| 1400.15 | peritectic: Liq + Ca2Pb ↔ Ca5Pb3 | Liq: Pb 0.4; Ca2Pb: Pb 0.333; Ca5Pb3: Pb 0.375 | experimental | [1] Cartigny 2004; _cites Bruzzone 1976_ [doi](https://doi.org/10.1016/0022-5088%2876%2990236-8) | Table 3, p. 4, row 9; `ORC-6VHCZIAUSX` |  |
| 1400 | Ca5Pb3 -> Ca2Pb + Liq. | Ca5Pb3: Pb 0.375; Ca2Pb: Pb 0.333333; L: Pb 0.4 | experimental | [2] Idbenali 2008; _cites Itkin 1992_ [doi](https://doi.org/10.1007/bf02667480) | Table 4, p. 5, row 7; `ORC-XHPCJXAFEV` |  |
| 1398 | Ca5Pb3 -> Ca2Pb + Liq. | Ca5Pb3: Pb 0.375; Ca2Pb: Pb 0.333333; L: Pb 0.3935 | model | [2] Idbenali 2008 | Table 4, p. 5, row 9; `ORC-SMVHYMG5JC` |  |
| 1247 | CaPb -> Ca5Pb3 + Liq. | CaPb: Pb 0.5; Ca5Pb3: Pb 0.375; L: Pb 0.491 | model | [2] Idbenali 2008 | Table 4, p. 5, row 12; `ORC-4ECHAQV2Y6` |  |
| 1241.15 | peritectic: Liq + Ca5Pb3 ↔ CaPb | Liq: Pb 0.505; Ca5Pb3: Pb 0.375; CaPb: Pb 0.5 | experimental | [1] Cartigny 2004; _cites Bruzzone 1976_ [doi](https://doi.org/10.1016/0022-5088%2876%2990236-8) | Table 3, p. 4, row 11; `ORC-2T7UDHNDIR` |  |
| 1241 | CaPb -> Ca5Pb3 + Liq. | CaPb: Pb 0.5; Ca5Pb3: Pb 0.375; L: Pb 0.52 | experimental | [2] Idbenali 2008; _cites Itkin 1992_ [doi](https://doi.org/10.1007/bf02667480) | Table 4, p. 5, row 10; `ORC-GRQ4GKGCRQ` |  |
| 1238.04 | peritectic: Liq + Ca5Pb3 ↔ CaPb | Liq: Pb 0.5002; Ca5Pb3: Pb 0.375; CaPb: Pb 0.5 | model | [1] Cartigny 2004 | Table 3, p. 4, row 10; `ORC-VGTIDXGVH3` |  |
| 1238.04 | CaPb -> Ca5Pb3 + Liq. | CaPb: Pb 0.5; Ca5Pb3: Pb 0.375; L: Pb 0.5002 | model | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 4, p. 5, row 11; `ORC-XC5QQZSRDE` |  |
| 1115 | congruent melting: Liq ↔ βCa | βCa: Pb 0 | model | [1] Cartigny 2004 | Table 3, p. 4, row 1; `ORC-437BZYQCSI` |  |
| 1023.15 | eutectic: Liq ↔ βCa + Ca2Pb | Liq: Pb 0.095; βCa: Pb 0; Ca2Pb: Pb 0.333 | experimental | [1] Cartigny 2004; _cites Bruzzone 1976_ [doi](https://doi.org/10.1016/0022-5088%2876%2990236-8) | Table 3, p. 4, row 5; `ORC-HUQGF5ILYZ` |  |
| 1023.13 | eutectic: Liq ↔ βCa + Ca2Pb | Liq: Pb 0.0974; βCa: Pb 0; Ca2Pb: Pb 0.333 | model | [1] Cartigny 2004 | Table 3, p. 4, row 4; `ORC-DUFX67JV2U` |  |
| 1023.13 | (βCa)+Ca2Pb -> Liq. | (βCa): Pb 0; Ca2Pb: Pb 0.333333; L: Pb 0.0974 | model | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 4, p. 5, row 2; `ORC-VZQFG2TCF3` |  |
| 1023 | (βCa)+Ca2Pb -> Liq. | (βCa): Pb 0; Ca2Pb: Pb 0.333333; L: Pb 0.095 | experimental | [2] Idbenali 2008; _cites Itkin 1992_ [doi](https://doi.org/10.1007/bf02667480) | Table 4, p. 5, row 1; `ORC-P52VUTZEEC` |  |
| 1017 | (βCa)+Ca2Pb -> Liq. | (βCa): Pb 0; Ca2Pb: Pb 0.333333; L: Pb 0.0761 | model | [2] Idbenali 2008 | Table 4, p. 5, row 3; `ORC-BCQWEGDUJK` |  |
| 939.15 | congruent melting: Liq ↔ CaPb3 | Liq: Pb 0.75; CaPb3: Pb 0.75 | experimental | [1] Cartigny 2004; _cites Bruzzone 1976_ [doi](https://doi.org/10.1016/0022-5088%2876%2990236-8) | Table 3, p. 4, row 15; `ORC-IPHEMDJBLT` |  |
| 924.21 | congruent melting: Liq ↔ CaPb3 | Liq: Pb 0.75; CaPb3: Pb 0.75 | model | [1] Cartigny 2004 | Table 3, p. 4, row 14; `ORC-TEKVXJUG2H` |  |
| 911.2 | CaPb + CaPb3 -> Liq. | CaPb: Pb 0.5; CaPb3: Pb 0.75; L: Pb 0.6974 | model | [2] Idbenali 2008 | Table 4, p. 5, row 15; `ORC-FPEI5NZWDI` |  |
| 911.15 | eutectic: Liq ↔ CaPb + CaPb3 | Liq: Pb 0.635; CaPb: Pb 0.5; CaPb3: Pb 0.75 | experimental | [1] Cartigny 2004; _cites Bruzzone 1976_ [doi](https://doi.org/10.1016/0022-5088%2876%2990236-8) | Table 3, p. 4, row 13; `ORC-W63GVA5JIN` |  |
| 911 | CaPb + CaPb3 -> Liq. | CaPb: Pb 0.5; CaPb3: Pb 0.75; L: Pb 0.635 | experimental | [2] Idbenali 2008; _cites Itkin 1992_ [doi](https://doi.org/10.1007/bf02667480) | Table 4, p. 5, row 13; `ORC-RXIT7ZFDJD` |  |
| 896.79 | eutectic: Liq ↔ CaPb + CaPb3 | Liq: Pb 0.6852; CaPb: Pb 0.5; CaPb3: Pb 0.75 | model | [1] Cartigny 2004 | Table 3, p. 4, row 12; `ORC-F3TEMXB2VM` |  |
| 896.79 | CaPb + CaPb3 -> Liq. | CaPb: Pb 0.5; CaPb3: Pb 0.75; L: Pb 0.6852 | model | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 4, p. 5, row 14; `ORC-O5LCJAQKTV` |  |
| 602.52 | Liq. + CaPb3 -> (Pb) | L: Pb 0.996; CaPb3: Pb 0.75; (Pb): Pb 0.9949 | model | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 4, p. 5, row 21; `ORC-44DQ6HQTBN` |  |
| 602.52 | peritectic: Liq ↔ CaPb3 + Pb | Liq: Pb 0.996; CaPb3: Pb 0.75; Pb: Pb 0.9961 | model | [1] Cartigny 2004 | Table 3, p. 4, row 16; `ORC-65NVS5MMVP` |  |
| 601.9 | peritectic: Liq ↔ CaPb3 + Pb | Liq: Pb 0.9964; CaPb3: Pb 0.75; Pb: Pb 0.9949 | experimental | [1] Cartigny 2004; _cites Vigdorovich 1959_ | Table 3, p. 4, row 17; `ORC-CIRCG3VOUE` |  |
| 600.65 | congruent melting: Liq ↔ Pb | Liq: Pb 0.01; Pb: Pb 1 | model | [1] Cartigny 2004 | Table 3, p. 4, row 18; `ORC-NPGXOLV7R5` |  |
| 599.2 | eutectic: Liq. -> CaPb3 + (Pb) | L: Pb 0.9959; CaPb3: Pb 0.75; (Pb): Pb 0.9964 | experimental | [2] Idbenali 2008; _cites Itkin 1992_ [doi](https://doi.org/10.1007/bf02667480) | Table 4, p. 5, row 19; `ORC-5E7JOIXT53` |  |
| 599.1 | eutectic: Liq. -> CaPb3 + (Pb) | L: Pb 0.9934; CaPb3: Pb 0.75; (Pb): Pb 0.997 | model | [2] Idbenali 2008 | Table 4, p. 5, row 20; `ORC-UPLGB72ZU7` |  |
| 292.6 | CaPb -> Ca5Pb3 + CaPb3 | CaPb: Pb 0.5; Ca5Pb3: Pb 0.375; CaPb3: Pb 0.75 | model | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 4, p. 5, row 22; `ORC-VTVUMVMAMC` |  |

## Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from [dft_parity.json](https://data.orchid-project.org/literature/dft_parity.json).

Table: Enthalpies of formation, Ca–Pb system (29)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Ca2Pb | [Ca2Pb](https://data.orchid-project.org/compounds/Ca2Pb.html) | -69.577 kJ/mol-atom | 300 | model | -53.157 (mp-aaaabtcg) | -54.694 (oqmd-10998) | [1] Cartigny 2004 | Table 2, p. 3, row 8; `ORC-26OFWWHHVQ` |  |
| Ca2Pb | [Ca2Pb](https://data.orchid-project.org/compounds/Ca2Pb.html) | -69.577 kJ/mol-atom | 300 | model | -53.157 (mp-aaaabtcg) | -54.694 (oqmd-10998) | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 5, p. 8, row 4; `ORC-RTPSUJ6ZCH` |  |
| Ca2Pb | [Ca2Pb](https://data.orchid-project.org/compounds/Ca2Pb.html) | -66.305 kJ/mol-atom | 300 | model | -53.157 (mp-aaaabtcg) | -54.694 (oqmd-10998) | [2] Idbenali 2008 | Table 5, p. 8, row 5; `ORC-FPAY4SRRJJ` |  |
| Ca2Pb | [Ca2Pb](https://data.orchid-project.org/compounds/Ca2Pb.html) | -62 kJ/mol-atom ± 2 | 300 | experimental | -53.157 (mp-aaaabtcg) | -54.694 (oqmd-10998) | [2] Idbenali 2008; _cites Sommer 2006_ [doi](https://doi.org/10.1016/j.intermet.2005.06.003) | Table 5, p. 8, row 1; `ORC-DRQY4EDHMG` |  |
| Ca2Pb | [Ca2Pb](https://data.orchid-project.org/compounds/Ca2Pb.html) | -59 kJ/mol-atom ± 1.5 | 300 | experimental | -53.157 (mp-aaaabtcg) | -54.694 (oqmd-10998) | [2] Idbenali 2008; _cites Bouirden 1984_ | Table 5, p. 8, row 3; `ORC-INPTZVNKKX` |  |
| Ca2Pb | [Ca2Pb](https://data.orchid-project.org/compounds/Ca2Pb.html) | -59 kJ/mol-atom ± 5 | 300 | experimental | -53.157 (mp-aaaabtcg) | -54.694 (oqmd-10998) | [2] Idbenali 2008; _cites Notin 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990177-x) | Table 5, p. 8, row 2; `ORC-NTVCF44WPZ` |  |
| Ca2Pb | [Ca2Pb](https://data.orchid-project.org/compounds/Ca2Pb.html) | -59 kJ/mol-atom ± 1.5 | 300 | experimental | -53.157 (mp-aaaabtcg) | -54.694 (oqmd-10998) | [1] Cartigny 2004; _cites Bouirden 1984_ | Table 2, p. 3, row 7; `ORC-RX7ZVH6AKG` |  |
| Ca5Pb3 | [Ca5Pb3](https://data.orchid-project.org/compounds/Ca5Pb3.html) | -69.354 kJ/mol-atom | 300 | model | -50.319 (mp-aaacpgte) | -51.959 (oqmd-55254) | [1] Cartigny 2004 | Table 2, p. 3, row 6; `ORC-462CZOYKID` |  |
| Ca5Pb3 | [Ca5Pb3](https://data.orchid-project.org/compounds/Ca5Pb3.html) | -69.354 kJ/mol-atom | 300 | model | -50.319 (mp-aaacpgte) | -51.959 (oqmd-55254) | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 5, p. 8, row 8; `ORC-YWMZKKVX56` |  |
| Ca5Pb3 | [Ca5Pb3](https://data.orchid-project.org/compounds/Ca5Pb3.html) | -64.032 kJ/mol-atom | 300 | model | -50.319 (mp-aaacpgte) | -51.959 (oqmd-55254) | [2] Idbenali 2008 | Table 5, p. 8, row 9; `ORC-PG4UPJCWGB` |  |
| Ca5Pb3 | [Ca5Pb3](https://data.orchid-project.org/compounds/Ca5Pb3.html) | -56 kJ/mol-atom ± 5 | 300 | experimental | -50.319 (mp-aaacpgte) | -51.959 (oqmd-55254) | [2] Idbenali 2008; _cites Notin 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990177-x) | Table 5, p. 8, row 7; `ORC-CMPX5LC4JT` |  |
| Ca5Pb3 | [Ca5Pb3](https://data.orchid-project.org/compounds/Ca5Pb3.html) | -56 kJ/mol-atom ± 1 | 300 | experimental | -50.319 (mp-aaacpgte) | -51.959 (oqmd-55254) | [1] Cartigny 2004; _cites Bouirden 1984_ | Table 2, p. 3, row 5; `ORC-JCGTLRZTGV` |  |
| Ca5Pb3 | [Ca5Pb3](https://data.orchid-project.org/compounds/Ca5Pb3.html) | -56 kJ/mol-atom ± 1 | 300 | experimental | -50.319 (mp-aaacpgte) | -51.959 (oqmd-55254) | [2] Idbenali 2008; _cites Bouirden 1984_ | Table 5, p. 8, row 6; `ORC-PMP6WF4RGT` |  |
| CaPb | [CaPb](https://data.orchid-project.org/compounds/CaPb.html) | -58.664 kJ/mol-atom | 1040 | model | -50.257 (mp-aaaabdqo) | -51.19 (oqmd-28966) | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 5, p. 8, row 12; `ORC-5CT2JJ3DIW` |  |
| CaPb | [CaPb](https://data.orchid-project.org/compounds/CaPb.html) | -58.664 kJ/mol-atom | 1040 | model | -50.257 (mp-aaaabdqo) | -51.19 (oqmd-28966) | [1] Cartigny 2004 | Table 2, p. 3, row 4; `ORC-E2M4QT2UHW` |  |
| CaPb | [CaPb](https://data.orchid-project.org/compounds/CaPb.html) | -57 kJ/mol-atom ± 2 | 1040 | experimental | -50.257 (mp-aaaabdqo) | -51.19 (oqmd-28966) | [2] Idbenali 2008; _cites Bouirden 1984_ | Table 5, p. 8, row 10; `ORC-TPLOTPL4WD` |  |
| CaPb | [CaPb](https://data.orchid-project.org/compounds/CaPb.html) | -57 kJ/mol-atom ± 2 | 1040 | experimental | -50.257 (mp-aaaabdqo) | -51.19 (oqmd-28966) | [1] Cartigny 2004; _cites Bouirden 1984_ | Table 2, p. 3, row 3; `ORC-YH5IZHGAMN` |  |
| CaPb | [CaPb](https://data.orchid-project.org/compounds/CaPb.html) | -55.78 kJ/mol-atom | 300 | model | -50.257 (mp-aaaabdqo) | -51.19 (oqmd-28966) | [2] Idbenali 2008 | Table 5, p. 8, row 13; `ORC-5FQK6RLRV6` |  |
| CaPb | [CaPb](https://data.orchid-project.org/compounds/CaPb.html) | -52.865 kJ/mol-atom | 300 | model | -50.257 (mp-aaaabdqo) | -51.19 (oqmd-28966) | [2] Idbenali 2008 | Table 5, p. 8, row 14; `ORC-6ZLIIJWT6L` |  |
| CaPb | [CaPb](https://data.orchid-project.org/compounds/CaPb.html) | -52 kJ/mol-atom ± 5 | 300 | experimental | -50.257 (mp-aaaabdqo) | -51.19 (oqmd-28966) | [2] Idbenali 2008; _cites Notin 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990177-x) | Table 5, p. 8, row 11; `ORC-EEZLEZRAVO` |  |
| CaPb3 | [CaPb3](https://data.orchid-project.org/compounds/CaPb3.html) | -36.251 kJ/mol-atom | 900 | model | -28.013 (mp-aaaabekj) | -32.338 (oqmd-18782) | [1] Cartigny 2004 | Table 2, p. 3, row 2; `ORC-F63SMGLFSE` |  |
| CaPb3 | [CaPb3](https://data.orchid-project.org/compounds/CaPb3.html) | -36.251 kJ/mol-atom | 900 | model | -28.013 (mp-aaaabekj) | -32.338 (oqmd-18782) | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 5, p. 8, row 17; `ORC-HQCKQ5AGCR` |  |
| CaPb3 | [CaPb3](https://data.orchid-project.org/compounds/CaPb3.html) | -35 kJ/mol-atom ± 0.3 | 900 | experimental | -28.013 (mp-aaaabekj) | -32.338 (oqmd-18782) | [1] Cartigny 2004; _cites Bouirden 1984_ | Table 2, p. 3, row 1; `ORC-TOWLZTJ2AH` |  |
| CaPb3 | [CaPb3](https://data.orchid-project.org/compounds/CaPb3.html) | -35 kJ/mol-atom ± 0.3 | 900 | experimental | -28.013 (mp-aaaabekj) | -32.338 (oqmd-18782) | [2] Idbenali 2008; _cites Bouirden 1984_ | Table 5, p. 8, row 16; `ORC-WYUVGUXXZD` |  |
| CaPb3 | [CaPb3](https://data.orchid-project.org/compounds/CaPb3.html) | -34 kJ/mol-atom ± 0.5 | 300 | experimental | -28.013 (mp-aaaabekj) | -32.338 (oqmd-18782) | [2] Idbenali 2008; _cites Notin 1989_ [doi](https://doi.org/10.1016/0022-5088%2889%2990177-x) | Table 5, p. 8, row 19; `ORC-AH7AAOAJWZ` |  |
| CaPb3 | [CaPb3](https://data.orchid-project.org/compounds/CaPb3.html) | -33.966 kJ/mol-atom | 300 | model | -28.013 (mp-aaaabekj) | -32.338 (oqmd-18782) | [2] Idbenali 2008 | Table 5, p. 8, row 21; `ORC-FTHWSN3N76` |  |
| CaPb3 | [CaPb3](https://data.orchid-project.org/compounds/CaPb3.html) | -33.8 kJ/mol-atom ± 1.4 | 800 | experimental | -28.013 (mp-aaaabekj) | -32.338 (oqmd-18782) | [2] Idbenali 2008; _cites Nouri 1985_ [doi](https://doi.org/10.1016/0040-6031%2885%2987099-4) | Table 5, p. 8, row 15; `ORC-AMGDFSUCY5` |  |
| CaPb3 | [CaPb3](https://data.orchid-project.org/compounds/CaPb3.html) | -33.2 kJ/mol-atom ± 2 | 300 | experimental | -28.013 (mp-aaaabekj) | -32.338 (oqmd-18782) | [2] Idbenali 2008; _cites Sommer 2006_ [doi](https://doi.org/10.1016/j.intermet.2005.06.003) | Table 5, p. 8, row 18; `ORC-D5LWL4JMJH` |  |
| CaPb3 | [CaPb3](https://data.orchid-project.org/compounds/CaPb3.html) | -32.358 kJ/mol-atom | 300 | model | -28.013 (mp-aaaabekj) | -32.338 (oqmd-18782) | [2] Idbenali 2008 | Table 5, p. 8, row 20; `ORC-YLXNO5FYWI` |  |

## Other properties

### Phase transition (9)

Table: Phase transition, Ca–Pb system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 924 K | 924 | congruent transformation | model | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | p. 4; `ORC-5RXTEM5YXY.b7267a` | “They are in satisfactory agreement, except the calculated congruent melting of CaPb3 (T = 925.8 K), close to the calculated one (T = 924 K) in Cartigny et al. \[12\] but somewhat lower than the experimental one (T = 939 K) in \[6,9\].” |
| Phase transition | 924.21 K | 924.21 | CaPb3 -> Liq.; _CaPb3: Pb 0.75; L: Pb 0.75_ | model | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 4, p. 5, row 17; `ORC-7RTR6SQER2` |  |
| Phase transition | 925.8 K | 925.8 | CaPb3 -> Liq.; _CaPb3: Pb 0.75; L: Pb 0.75_ | model | [2] Idbenali 2008 | Table 4, p. 5, row 18; `ORC-P7XKACYGK3` |  |
| Phase transition | 925.8 K | 925.8 | congruent transformation | model | [2] Idbenali 2008 | p. 4; `ORC-5RXTEM5YXY.3f844e` | “They are in satisfactory agreement, except the calculated congruent melting of CaPb3 (T = 925.8 K), close to the calculated one (T = 924 K) in Cartigny et al. \[12\] but somewhat lower than the experimental one (T = 939 K) in \[6,9\].” |
| Phase transition | 939 K | 939 | CaPb3 -> Liq.; _CaPb3: Pb 0.75; L: Pb 0.75_ | experimental | [2] Idbenali 2008; _cites Itkin 1992_ [doi](https://doi.org/10.1007/bf02667480) | Table 4, p. 5, row 16; `ORC-7PNLTCWHJI` |  |
| Phase transition | 939 K | 939 | congruent transformation | experimental | [2] Idbenali 2008; _cites Itkin 1992_ [doi](https://doi.org/10.1007/bf02667480) | p. 4; `ORC-5RXTEM5YXY.d0c864` | “They are in satisfactory agreement, except the calculated congruent melting of CaPb3 (T = 925.8 K), close to the calculated one (T = 924 K) in Cartigny et al. \[12\] but somewhat lower than the experimental one (T = 939 K) in \[6,9\].” |
| Phase transition | 1476 K | 1476 | Ca2Pb -> Liq.; _Ca2Pb: Pb 0.333333; L: Pb 0.3333_ | experimental | [2] Idbenali 2008; _cites Itkin 1992_ [doi](https://doi.org/10.1007/bf02667480) | Table 4, p. 5, row 4; `ORC-PNC7P362GP` |  |
| Phase transition | 1476.52 K | 1476.52 | Ca2Pb -> Liq.; _Ca2Pb: Pb 0.333333; L: Pb 0.3333_ | model | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 4, p. 5, row 5; `ORC-77MZYQOPUT` |  |
| Phase transition | 1482 K | 1482 | Ca2Pb -> Liq.; _Ca2Pb: Pb 0.333333; L: Pb 0.3333_ | model | [2] Idbenali 2008 | Table 4, p. 5, row 6; `ORC-MKLG3ST354` |  |

### Mixing / partial (12)

Table: Mixing / partial, Ca–Pb system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Enthalpy of mixing | -57.297 kJ/mol-atom | 1020 | Ca2Pb(l); _alloy: Pb 0.333333_ | model | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 5, p. 8, row 30; `ORC-2OS4DR4IGR.e83fdd` |  |
| Enthalpy of mixing | -54 kJ/mol-atom ± 2.5 | 1020 | Ca2Pb(l); _alloy: Pb 0.333333_ | experimental | [2] Idbenali 2008; _cites Sommer 2006_ [doi](https://doi.org/10.1016/j.intermet.2005.06.003) | Table 5, p. 8, row 28; `ORC-67R62WBVGI.f4efec` |  |
| Enthalpy of mixing | -53.756 kJ/mol-atom | 1020 | Ca2Pb(l); _alloy: Pb 0.333333_ | model | [2] Idbenali 2008 | Table 5, p. 8, row 29; `ORC-F54SY2W5MY.492bc2` |  |
| Enthalpy of mixing | -26.804 kJ/mol-atom | 1020 | CaPb3(l); _alloy: Pb 0.75_ | model | [2] Idbenali 2008 | Table 5, p. 8, row 32; `ORC-3WPS7C3AWN.607b0e` |  |
| Enthalpy of mixing | -27.426 kJ/mol-atom | 1020 | CaPb3(l); _alloy: Pb 0.75_ | model | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 5, p. 8, row 33; `ORC-IB4R7S2BR5.333a77` |  |
| Enthalpy of mixing | -27 kJ/mol-atom ± 2 | 1020 | CaPb3(l); _alloy: Pb 0.75_ | experimental | [2] Idbenali 2008; _cites Sommer 2006_ [doi](https://doi.org/10.1016/j.intermet.2005.06.003) | Table 5, p. 8, row 31; `ORC-JR73AQEICV.511c7b` |  |
| Enthalpy of mixing | -57.297 kJ/mol-atom | 1020 | liquid; _alloy: Pb 0.333333_ | model | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 5, p. 8, row 30; `ORC-2OS4DR4IGR.ca3dda` |  |
| Enthalpy of mixing | -26.804 kJ/mol-atom | 1020 | liquid; _alloy: Pb 0.75_ | model | [2] Idbenali 2008 | Table 5, p. 8, row 32; `ORC-3WPS7C3AWN.fb1392` |  |
| Enthalpy of mixing | -54 kJ/mol-atom ± 2.5 | 1020 | liquid; _alloy: Pb 0.333333_ | experimental | [2] Idbenali 2008; _cites Sommer 2006_ [doi](https://doi.org/10.1016/j.intermet.2005.06.003) | Table 5, p. 8, row 28; `ORC-67R62WBVGI.a5f5b2` |  |
| Enthalpy of mixing | -53.756 kJ/mol-atom | 1020 | liquid; _alloy: Pb 0.333333_ | model | [2] Idbenali 2008 | Table 5, p. 8, row 29; `ORC-F54SY2W5MY.75d272` |  |
| Enthalpy of mixing | -27.426 kJ/mol-atom | 1020 | liquid; _alloy: Pb 0.75_ | model | [2] Idbenali 2008; _cites Cartigny 2004_ [doi](https://doi.org/10.1016/j.tca.2004.01.001) | Table 5, p. 8, row 33; `ORC-IB4R7S2BR5.7c97b4` |  |
| Enthalpy of mixing | -27 kJ/mol-atom ± 2 | 1020 | liquid; _alloy: Pb 0.75_ | experimental | [2] Idbenali 2008; _cites Sommer 2006_ [doi](https://doi.org/10.1016/j.intermet.2005.06.003) | Table 5, p. 8, row 31; `ORC-JR73AQEICV.fef2ee` |  |

## Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

1. Y. Cartigny, J.M. Fiorani, A. Maı̂tre, M. Vilasi, Thermodynamic assessment of the Ca–Pb system, Thermochimica Acta 414, 197-202 (2004). [doi:10.1016/j.tca.2004.01.001](https://doi.org/10.1016/j.tca.2004.01.001)
2. M. Idbenali, C. Servant, N. Selhaoui, L. Bouirden, A thermodynamic reassessment of the Ca–Pb system, Calphad 32, 64-73 (2008). [doi:10.1016/j.calphad.2007.10.004](https://doi.org/10.1016/j.calphad.2007.10.004)

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735569
- R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735859
- R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735891
- R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23736065

Also cite the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0).

Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

```bibtex
@misc{orchid_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}
```

---

Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).